this mean that the result of scientific study that use qualitative approach can be easily influenced by the researchers.
For example, let's say that there is a study regarding a response to a certain movie based personal opinion. (qualitative approach)
To influence the opinion of the subject, the researchers could easily placed several actors among the subjects and told them to completely voiced up one type of response to the movie. In such situation, Other non-actor subjects would most likely feel some sort of pressure to conform to public opinion and change their response to the movie.